The invention provides a redundant cooling system with abatement of noise from cooling fans used primarily in computer equipment and other boxes housing electronic equipment. Typically either the computer system or box housing electronic components has two parallel side panels, a front panel, and a back panel upon which cooling fans are mounted to draw air across various electronic components and through the box for heat dissipation. The cooling system includes an airflow grille attached to one end of a laminar flow duct and two adjacent cooling fans mounted to the other end of a laminar flow duct which includes a venturi opening on the top panel of the laminar flow duct to facilitate laminar flow through the laminar flow duct at a distance before the cooling fans and at a distance after the cooling fans.
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2. A method for cooling electronics and minimizing aerodynamic and electromagnetic noise, including steps for:
cooling incoming air with one or more cooling fans in a housing, disposed for providing positive airflow over a first planar region, along a first linear axis substantially parallel to the first planar region; receiving air through an airflow grille which defines a second planar region substantially perpendicular to said first linear axis, said airflow grille defining a set of through-holes substantially parallel to said first linear axis; and receiving air through a first laminar flow region disposed between said cooling fans and said airflow grille, said first laminar flow region defined by a laminar flow duct, said laminar flow duct being coupled on a first end to a housing for said one or more cooling fans and on a second end to said airflow grille, and said laminar flow duct being substantially parallel to said first linear axis.
1. A cooling system which reduces aerodynamic and electromagnetic noise comprising:
one or more cooling fans in a housing, each fan having a toroidal fan opening and disposed for providing positive airflow over a first planar region, along a first linear axis substantially parallel to the first planar region; an airflow grille, defining a second planar region substantially perpendicular to said first linear axis, said airflow grille defining a set of through-holes substantially parallel to said first linear axis wherein said grille opening is equal to or greater than said toroidal fan opening such that aerodynamic and electromagnetic noise are minimized; and a first laminar flow region disposed between said cooling fans and said airflow grille, said first laminar flow region defined by a laminar flow duct wherein said laminar flow duct has a geometry of a rectangular solid such that said laminar flow duct defines a venturi opening, said venturi opening being operative in conjunction with said one or more cooling fans to provide airflow through said venturi opening from a region both upstream and above a region of said laminar flow duct containing said venturi opening wherein airflow is parallel to said first laminar flow region, said laminar flow duct being coupled on a first end to a housing for said one or more cooling fans and on a second end to said airflow grille, and said laminar flow duct being substantially parallel to said first linear axis, wherein said laminar flow duct acts as an rf collimator to reduce electromagnetic noise.
3. A method for cooling electronics and minimizing aerodynamic and electromagnetic noise, including steps for:
cooling incoming air with one or more cooling fans in a housing, each fan having a toroidal fan opening and disposed for providing positive airflow over a first planar region, along a first linear axis substantially parallel to the first planar region; receiving air through an airflow grille which defines a second planar region substantially perpendicular to said first linear axis, said airflow grille defining a set of through-holes substantially parallel to said first linear axis wherein said grille opening is equal to or greater than said toroidal fan opening such that aerodynamic and electromagnetic noise are minimized; and receiving air through a first laminar flow region disposed between said cooling fans and said airflow grille, said first laminar flow region defined by a laminar flow duct wherein said laminar flow duct has a geometry of a rectangular solid such that said laminar flow duct defines a venturi opening, said venturi opening being operative in conjunction with said one or more cooling fans to provide airflow through said venturi opening from a region both upstream and above a region of said laminar flow duct containing said venturi opening wherein airflow is parallel to said first laminar flow region, said laminar flow duct being coupled on a first end to a housing for said one or more cooling fans and on a second end to said airflow grille, and said laminar flow duct being substantially parallel to said first linear axis wherein said laminar flow duct acts as an rf collimator to reduce electromagnetic noise.
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This invention relates to noise reduced computer fan cooling systems.
Personal computers and generic boxes housing electronic components are conventionally cooled by fans mounted to their back panels that blow air across their respective components and transfer heat through convection.
The design trend towards smaller enclosures packing more computing power in less space has increased the amount of heat generated per unit area and consequently has required more effective and reliable cooling. Failure to provide adequate cooling can result in electronic component or peripheral failure, the loss of valuable computing time, and wasted resources in recovering lost data. It is therefore more cost efficient to provide a given box with the requisite cooling initially than to repair and retrofit. However, it is also important to provide cooling without introducing acoustic noise that could diminish system efficiency. System acoustic noise generally takes two forms: mechanical noise and aerodynamic noise.
Mechanical noise is generated from the vibration of moving parts such as fans and disk drives. Aerodynamic noise is generated from turbulent airflow across and in the vicinity of the fan blades. The design and implementation of grommets or other dampening devices for minimizing mechanical noise is well known in the art. Techniques of minimizing aerodynamic noise are less well known. However, while less well known and less critical than the techniques for minimizing mechanical noise they are still important for optimizing system efficiency.
In general, aerodynamic noise generated by cooling fans is a function of the type of flow in the region surrounding the fan blades, flow velocity, fan blade shape, number of fan blades and the shape of the duct in which the fan is housed.
Many different approaches have been tried to minimize cooling fan noise. These approaches try to minimize noise contributions by modifying at least one of the aforementioned parameters. However, a first problem known in the art is that changing flow velocity and type of flow can result in less cooling and it would be desirable to change flow characteristics to minimize noise without diminishing cooling capacity.
It is known in the art to provide a grille at an airflow entrance for the fan both for human safety and for minimizing radiated electromagnetic noise. A second problem known in the art is that an airflow grille with grill openings small enough to minimize both radiated electromagnetic noise and human contact with rotating fan blades can decrease the efficiency of the fan. This efficiency decrease can result from at least two factors. (1) The airflow grille produces back-pressure on the fan, so that operation of the fan is strained and the fan can be subject to extra wear. (2) The airflow grille produces turbulence, so that operation of the fan is less efficient and airflow over the systems or equipment is less efficient at cooling.
Accordingly, it would be advantageous to provide a cooling system and a method for operating a cooling system, which has relatively reduced noise and is relatively efficient and inexpensive. This advantage is achieved in an embodiment of the invention in which a laminar flow duct modifies flow characteristics by separating a set of cooling fans from an airflow grille. Thus, back pressure on the fan is reduced and laminar flow through the fan and over the systems or equipment is improved.
The invention provides a cooling system and a method for operating a cooling system, which has relatively reduced noise and is relatively efficient and inexpensive. A set of cooling fans operates in conjunction with an airflow grille and a laminar flow duct, so as to reduce the amount of aerodynamic noise, and to block dust and other foreign objects. A laminar flow duct separates the cooling fans from the airflow grille, so as to reduce back pressure on the fan and improve laminar flow through the fan and over the systems or equipment. Additionally, the laminar flow duct acts to reduce electromagnetic noise.
In a preferred embodiment, the laminar flow duct defines a Venturi opening, so as to draw airflow into the cooling fans from a region adjacent to the laminar flow duct. The Venturi opening allows the cooling fans to cool a secondary set of systems or equipment, such as a set of disk drives or other equipment that need relatively minimal cooling effect.
In the following description, a preferred embodiment of the invention is described with regard to preferred process steps and geometries. Those skilled in the art would recognize after perusal of this application that embodiments of the invention can be implemented using cooling systems adapted to particular process steps and geometries described herein, and that implementation of the process steps and geometries described herein would not require undue experimentation or further invention.
System Elements
Method of Operation
In a preferred embodiment the laminar flow duct 110 is a rectangular solid, 3 to 5 inches in length, and defines an anterior end and a posterior end.
As shown in
The breakaway view in
This provides cooling not only in the region downstream from the set of cooling fans 121 but also in the region of the laminar flow duct 110 upstream from the Venturi opening 111. The presence of two air streams, one at the output of the set of cooling fans 121 and one along the region of the laminar flow duct containing the Venturi opening 111 is advantageous in that components can be cooled both downstream and upstream from the set of cooling fans thus lending flexibility to component placement and box design. For example, in a preferred embodiment, a disk drive or other component that does not require a high flow rate for cooling may be placed in the air stream created by the Venturi downdraft.
The design of the cooling system 100 is such that the set of cooling fans 121 are redundant and only one is necessary to cool a given personal computer or electronic box. However, the presence of the additional fan decreases the load on the individual fans and thereby increases fan efficiency and fan life. Moreover, it adds redundancy to the cooling mechanism, when desired, so immediate attention is not needed in the case of any one fan failure.
Laminar flow duct 110 in addition to conducting the laminar flow air stream from the airflow grille 130 to the set of cooling fans 121 acts as a RF collimator and reduces emission spread. That is it acts to minimize EM noise. Similarly, the small grille opening pattern 131 wherein the size of the opening is small in comparison to the wavelength of the radiated EM noise provides better rejection of RF noise emission.
The length of the laminar flow duct 110 allows the incoming air to transition from turbulent flow to laminar flow. In addition, maintaining an overall grille opening pattern 131 area that is greater than or equal to the fan toroidal opening 122 contributes to laminar flow within the laminar flow duct 110 proximate to the set of cooling fans 121 and lengthens the zone of laminar flow from the zone proximate to the set of cooling fans 121 to the region proximate to the airflow grille 130. The increased area of the grille opening pattern 131 also restricts airflow less than conventional airflow grilles and hence decreases back pressure thereby minimizing both fan bearing and motor stress and their concomitant mechanical noise.
Although preferred embodiments are disclosed herein, many variations are possible which remain within the concept, scope, and spirit of the invention, and these variations would become clear to those skilled in the art after perusal of this application.
Langdon, Daryl J., Robbins, Robert
Patent | Priority | Assignee | Title |
10403328, | Jan 29 2016 | Western Digital Technologies, INC | Acoustic attenuation in data storage enclosures |
10473317, | Jul 20 2011 | HGCI, INC | Cooling a horticulture light fixture using an isolation chamber |
10593370, | Nov 06 2018 | Western Digital Technologies, Inc. | Reducing vibration of data storage device in a data storage system |
10955127, | Jul 20 2011 | HGCI, Inc. | Cooling a horticulture light fixture using an isolation chamber |
11877551, | Jul 20 2011 | HGCI, Inc. | Cooling a horticulture light fixture using an isolation chamber |
6468150, | Nov 30 1998 | NetApp, Inc | Laminar flow duct cooling system |
6944020, | Jun 20 2002 | Mahle International GmbH | Computer enclosure air distribution system |
9016907, | Jul 18 2013 | HGCI, INC | Air cooled horticulture lighting fixture for a double ended high pressure sodium lamp |
9335038, | Jul 20 2011 | HGCI, INC | Vertically disposed HID lamp fixture |
9750199, | Jul 18 2013 | HGCI, INC | Air cooled horticulture lighting fixture |
9752766, | Jul 18 2013 | HGCI, INC | Air cooled horticulture lighting fixture |
9888633, | Jul 18 2013 | HGCI, INC | Air cooled horticulture lighting fixture |
9903578, | Jul 18 2013 | HGCI, INC | Air cooled horticulture lighting fixture for a double ended high pressure sodium lamp |
D737498, | Jun 20 2013 | HGCI, INC | Horticulture grow light fixture |
D739595, | Jul 09 2013 | HGCI, INC | Horticulture grow light housing |
D750313, | Jul 09 2013 | HGCI, INC | Grow light fixture |
D756026, | Sep 11 2014 | HGCI, INC | Light fixture |
D757346, | Jan 08 2015 | HGCI, INC | Horticulture grow light |
D758646, | Feb 11 2014 | HGCI, INC | Double ended lamp reflector kit |
D769513, | Apr 15 2015 | HGCI, INC | Light fixture |
D769514, | Oct 22 2014 | HGCI, INC | Horticulture grow light |
D770079, | Apr 02 2015 | HGCI, INC | Light fixture |
D770670, | Jun 24 2015 | HGCI, INC | Horticulture grow light |
D771301, | Jun 20 2013 | HGCI, INC | Horticulture grow light fixture |
D773107, | Apr 13 2015 | HGCI, INC | Horticulture grow light |
D775406, | Feb 24 2014 | HGCI, INC | Horticulture grow light reflector |
D775760, | Mar 27 2013 | HGCI, INC | Horticulture grow light housing |
D781492, | Jun 24 2015 | HGCI, INC | Horticulture grow light |
D783887, | Dec 11 2014 | HGCI, INC | Horticulture grow light |
D786488, | Apr 15 2015 | HGCI, INC | Light fixture |
D792635, | Aug 07 2014 | HGCI, INC | Horticulture grow light |
D793616, | Sep 11 2014 | HGCI, INC | Light fixture |
D796727, | Jul 09 2013 | HGCI, INC | Horticulture grow light housing |
D796728, | Jun 06 2016 | HGCI, INC | Light fixture |
D797350, | Nov 01 2016 | HGCI, INC | Light fixture |
D797353, | Jun 11 2014 | HGCI, INC | Sealed optics air cooled grow light |
D802826, | Jun 11 2014 | HGCI, INC | Sealed optics air cooled grow light |
D802828, | Jun 20 2013 | HGCI, INC | Horticulture grow light fixture |
D802829, | Jun 24 2015 | HGCI, INC | Horticulture grow light |
D802830, | Jun 26 2012 | HGCI, INC | Light fixture |
D804078, | Aug 31 2016 | HGCI, INC | Light fixture |
D804079, | Aug 31 2016 | HGCI, INC | Light fixture |
D804706, | Jan 05 2016 | HGCI, INC | Light fixture |
D804707, | Jan 07 2016 | HGCI, INC | Light fixture |
D804708, | Apr 15 2015 | HGCI, INC | Light fixture |
D804709, | Apr 15 2015 | HGCI, INC | Light fixture |
D814687, | Jan 08 2015 | HGCI, INC | Light fixture |
D822882, | May 17 2017 | HGCI, INC | Horticulture grow light |
D825826, | Jun 11 2014 | HGCI, INC | Sealed optics air cooled grow light |
D825827, | Jan 05 2016 | HGCI, INC | Light fixture |
D825828, | Jan 07 2016 | HGCI, INC | Light fixture |
D826467, | Nov 01 2016 | HGCI, INC | Light fixture |
D826468, | Jun 26 2012 | HGCI, INC | Light fixture |
D826469, | Jun 24 2015 | HGCI, INC | Horticulture grow light |
D837442, | Sep 11 2014 | HGCI, INC | Light fixture |
D839471, | Jun 06 2016 | HGCI, INC | Light fixture |
D842532, | Oct 25 2017 | HGCI, INC | Light fixture |
D843049, | Sep 14 2017 | HGCI, INC | Horticulture grow light |
D843640, | Jun 20 2013 | HGCI, INC | Horticulture grow light fixture |
D847394, | Feb 11 2014 | HGCI, INC | Double ended lamp reflector kit |
D848663, | Nov 03 2017 | HGCI, INC | Light fixture |
D848664, | Nov 07 2017 | HGCI, INC | Light fixture |
D848665, | Nov 08 2017 | HGCI, INC | Horticulture grow light |
D851804, | Aug 31 2016 | HGCI, INC | Light fixture |
D854229, | Jun 11 2014 | HGCI, INC | Sealed optics air cooled grow light |
D871654, | Oct 30 2017 | HGCI, INC | Light fixture |
D873467, | Aug 31 2016 | HGCI, INC | Light fixture |
D940381, | Sep 11 2014 | HGCI, Inc. | Light fixture |
D942067, | Nov 08 2017 | HGCI, Inc. | Horticulture grow light |
D950833, | Sep 14 2017 | HGCI, Inc. | Horticulture grow light |
D951525, | Jun 06 2016 | HGCI, Inc. | Light fixture |
D985181, | Nov 03 2017 | HGCI, Inc. | Light fixture |
ER1210, | |||
ER1828, | |||
ER398, | |||
ER4774, | |||
ER5352, | |||
ER8596, |
Patent | Priority | Assignee | Title |
3813529, | |||
3893024, | |||
4075691, | Nov 06 1975 | CONTEL FEDERAL SYSTEMS, INC , A DE CORP | Communication control unit |
4075704, | Jul 02 1976 | Silicon Graphics, Inc | Floating point data processor for high speech operation |
4156907, | Mar 02 1977 | Unisys Corporation | Data communications subsystem |
4333144, | Feb 05 1980 | The Bendix Corporation | Task communicator for multiple computer system |
4351023, | Apr 11 1980 | The Foxboro Company | Process control system with improved system security features |
4377843, | Apr 19 1979 | Wescom Switching, Inc. | Data distribution interface |
4399503, | Jun 30 1978 | CONTEL FEDERAL SYSTEMS, INC , A DE CORP | Dynamic disk buffer control unit |
4456957, | Sep 28 1981 | NCR Corporation | Apparatus using a decision table for routing data among terminals and a host system |
4459664, | Feb 25 1981 | U S PHILIPS CORPORATION | Multiprocessor computer system with dynamic allocation of multiprocessing tasks and processor for use in such multiprocessor computer system |
4488231, | |||
4494188, | Apr 03 1981 | Hitachi, Ltd. | Method of processing an operating system in a multi-processor system |
4527232, | Jul 02 1982 | SUN MICROSYSTEMS, INC , A DE CORP | High-speed memory and memory management system |
4550368, | Jul 02 1982 | SUN MICROSYSTEMS, INC , A DE CORP | High-speed memory and memory management system |
4589067, | May 27 1983 | Analogic Corporation | Full floating point vector processor with dynamically configurable multifunction pipelined ALU |
4620292, | Oct 31 1980 | Hitachi, Ltd.; Hitachi Denshi Kabusihiki Kaisha | Arithmetic logic unit for floating point data and/or fixed point data |
4685125, | Jun 28 1982 | NCR Corporation | Computer system with tasking |
4710868, | Jun 29 1984 | International Business Machines Corporation | Interconnect scheme for shared memory local networks |
4719569, | Oct 11 1985 | SUN MICROSYSTEMS, INC , A DE CORP | Arbitrator for allocating access to data processing resources |
4742447, | Jan 16 1986 | International Business Machines Corporation | Method to control I/O accesses in a multi-tasking virtual memory virtual machine type data processing system |
4742450, | Jan 16 1986 | International Business Machines Corporation | Method to share copy on write segment for mapped files |
4761737, | Jan 16 1986 | International Business Machines Corporation | Method to automatically increase the segment size of unix files in a page segmented virtual memory data processing system |
4761785, | Jun 12 1986 | International Business Machines Corporation | Parity spreading to enhance storage access |
4766534, | Oct 16 1986 | American Telephone and Telegraph Company, AT&T Bell Laboratories | Parallel processing network and method |
4780821, | Jul 29 1986 | International Business Machines Corp. | Method for multiple programs management within a network having a server computer and a plurality of remote computers |
4783730, | Sep 19 1986 | Datapoint Corporation | Input/output control technique utilizing multilevel memory structure for processor and I/O communication |
4803621, | Jul 24 1986 | SUN MICROSYSTEMS, INC , A DE CORP | Memory access system |
4819159, | Aug 29 1986 | Symantec Corporation; Symantec Operating Corporation | Distributed multiprocess transaction processing system and method |
4825354, | Nov 12 1985 | NCR Corporation | Method of file access in a distributed processing computer network |
4827411, | Jun 15 1987 | International Business Machines Corporation; INTERNATIONAL BUSINESS MACHINES CORPORATION, ARMONK, NY 10504, A CORP OF NY | Method of maintaining a topology database |
4845609, | Jul 25 1986 | SYSTECH CORPORATION; SYSTECH CORPORATION, A CORP OF CA | Computer communications subsystem using an embedded token-passing network |
4875159, | Dec 22 1987 | Amdahl Corporation | Version management system using plural control fields for synchronizing two versions of files in a multiprocessor system |
4887204, | Feb 13 1987 | International Business Machines Corporation | System and method for accessing remote files in a distributed networking environment |
4897781, | Feb 13 1987 | International Business Machines Corporation | System and method for using cached data at a local node after re-opening a file at a remote node in a distributed networking environment |
4914583, | Apr 13 1988 | MOTOROLA COMPUTER X, INC | Method of indicating processes resident within a cell of a data processing system |
4937763, | Sep 06 1988 | SMARTSIGNAL CORP | Method of system state analysis |
4965772, | Jun 15 1987 | INTERNATIONAL BUSINESS MACHINES CORPORATION, A CORP OF NY | Method and apparatus for communication network alert message construction |
4969118, | Jan 13 1989 | International Business Machines Corporation; INTERNATIONAL BUSINESS MACHINES CORPORATION, A CORP OF NY | Floating point unit for calculating A=XY+Z having simultaneous multiply and add |
4984272, | Nov 30 1988 | AT&T Bell Laboratories; BELL TELEPHONE LABORATORIES, INCORPORATED, A CORP OF NY ; AMERICAN TELEPHONE AND TELEGRAPH COMPANY, A CORP OF NY | Secure file handling in a computer operating system |
5001628, | Feb 13 1987 | International Business Machines Corporation | Single system image uniquely defining an environment for each user in a data processing system |
5001712, | Oct 17 1988 | Lockheed Martin Corp | Diagnostic error injection for a synchronous bus system |
5008786, | Sep 11 1985 | Texas Instruments Incorporated | Recoverable virtual memory having persistant objects |
5018144, | Apr 28 1989 | International Business Machines Corporation | Logic performance verification and transition fault detection |
5043871, | Mar 26 1986 | Hitachi, Ltd. | Method and apparatus for database update/recovery |
5043876, | May 27 1988 | International Business Machines Corporation | N-level file shadowing and recovery in a shared file system |
5049873, | Jan 29 1988 | Network Equipment Technologies, Inc. | Communications network state and topology monitor |
5067099, | Nov 03 1988 | DIO TECHNOLOGY HOLDINGS LLC | Methods and apparatus for monitoring system performance |
5107500, | Apr 20 1988 | Fujitsu Ltd. | Diagnostic expert system |
5113442, | Mar 06 1989 | SHL SYSTEMHOUSE CORP | Method and apparatus for providing access control in a secure operating system |
5134619, | Apr 06 1990 | EMC Corporation | Failure-tolerant mass storage system |
5144659, | Apr 19 1989 | INTELLECTUAL VENTURES FUND 24 LLC | Computer file protection system |
5146588, | Nov 26 1990 | Storage Technology Corporation | Redundancy accumulator for disk drive array memory |
5155835, | Nov 19 1990 | Storage Technology Corporation | Multilevel, hierarchical, dynamically mapped data storage subsystem |
5163131, | Sep 08 1989 | NetApp, Inc | Parallel I/O network file server architecture |
5163148, | Aug 11 1989 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | File backup system for producing a backup copy of a file which may be updated during backup |
5182805, | Jul 14 1989 | TERADATA US, INC | Method and system for determining copy-on-write condition |
5195100, | Mar 02 1990 | EMC Corporation | Non-volatile memory storage of write operation identifier in data sotrage device |
5202983, | Dec 19 1988 | Kabushiki Kaisha Toshiba | File accessing system using code name to access selected conversion table for converting simplified file name into original file name |
5208813, | Oct 23 1990 | EMC Corporation | On-line reconstruction of a failed redundant array system |
5218695, | Feb 05 1990 | EPOCH SYSTEMS, INC , A CORP OF DE | File server system having high-speed write execution |
5218696, | Jul 24 1989 | International Business Machines Corporation | Method for dynamically expanding and rapidly accessing file directories |
5222217, | Jan 18 1989 | International Business Machines Corporation | System and method for implementing operating system message queues with recoverable shared virtual storage |
5235601, | Dec 21 1990 | EMC Corporation | On-line restoration of redundancy information in a redundant array system |
5251308, | Dec 22 1987 | Sun Microsystems, Inc | Shared memory multiprocessor with data hiding and post-store |
5255270, | Nov 07 1990 | EMC Corporation | Method of assuring data write integrity on a data storage device |
5261044, | Sep 17 1990 | CONCORD COMMUNICATIONS, INC ; Computer Associates Think, Inc | Network management system using multifunction icons for information display |
5261051, | Aug 14 1989 | Microsoft Technology Licensing, LLC | Method and system for open file caching in a networked computer system |
5274799, | Jan 04 1991 | EMC Corporation | Storage device array architecture with copyback cache |
5274807, | Nov 01 1990 | AT&T Bell Laboratories | Method for reducing magnetic storage volume for computer disk image backup |
5276840, | Mar 22 1991 | Wistron Corp | Disk caching method for writing data from computer memory including a step of writing a plurality of physically adjacent blocks in a single I/O operation |
5276867, | Dec 19 1989 | EPOCH SYSTEMS, INC , A CORP OF DE | Digital data storage system with improved data migration |
5283830, | Dec 17 1991 | International Computers Limited | Security mechanism for a computer system |
5297265, | Dec 22 1987 | Sun Microsystems, Inc | Shared memory multiprocessor system and method of operation thereof |
5305326, | Mar 06 1992 | DATA GENERAL CORPORATION, A CORP OF DE | High availability disk arrays |
5313626, | Dec 17 1991 | Dell USA L P | Disk drive array with efficient background rebuilding |
5313646, | Jun 10 1989 | Sun Microsystems, Inc. | Method and apparatus for translucent file system |
5313647, | Sep 20 1991 | KENDALL SQUARE RESEARCH CORPORATION, A CORP OF DELAWARE | Digital data processor with improved checkpointing and forking |
5315602, | Aug 12 1992 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Optimized stripe detection for redundant arrays of disk drives |
5317731, | Feb 25 1991 | International Business Machines Corporation | Intelligent page store for concurrent and consistent access to a database by a transaction processor and a query processor |
5333305, | Dec 27 1991 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | Method for improving partial stripe write performance in disk array subsystems |
5335235, | Jul 07 1992 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | FIFO based parity generator |
5355453, | Sep 08 1989 | Auspex Systems, Inc. | Parallel I/O network file server architecture |
5357509, | Nov 30 1990 | Fujitsu Limited | Data writing during process of data restoration in array disk storage system |
5357612, | Feb 27 1990 | International Business Machines Corporation | Mechanism for passing messages between several processors coupled through a shared intelligent memory |
5377196, | Mar 12 1991 | Agilent Technologies Inc | System and method of proactively and reactively diagnosing a data communication network |
5379417, | Nov 25 1991 | HEWLETT-PACKARD DEVELOPMENT COMPANY, L P | System and method for ensuring write data integrity in a redundant array data storage system |
5430729, | Apr 04 1994 | CDC PROPRIETE INTELLECTUELLE | Method and apparatus for adaptive directed route randomization and distribution in a richly connected communication network |
5454095, | Jan 28 1991 | Robert Bosch GmbH | Multi-processor system in which at least two processors access the same memory |
5463642, | Jun 29 1993 | RENESAS ELECTRONICS AMERICA INC | Method and apparatus for determining error location |
5485455, | Jan 28 1994 | ENTERASYS NETWORKS, INC | Network having secure fast packet switching and guaranteed quality of service |
5490248, | Feb 16 1993 | International Business Machines Corporation | Disk array system having special parity groups for data blocks with high update activity |
5497343, | Aug 05 1993 | Hyundai Electronics America | Reducing the number of carry-look-ahead adder stages in high-speed arithmetic units, structure and method |
5502836, | Nov 21 1991 | SAMSUNG ELECTRONICS CO , LTD | Method for disk restriping during system operation |
5504883, | Feb 01 1993 | Sun Microsystems, Inc | Method and apparatus for insuring recovery of file control information for secondary storage systems |
5519844, | Nov 09 1990 | EMC Corporation | Logical partitioning of a redundant array storage system |
5535375, | Apr 20 1992 | International Business Machines Corporation | File manager for files shared by heterogeneous clients |
5555244, | May 19 1994 | Cisco Technology, Inc | Scalable multimedia network |
5572711, | Sep 28 1993 | BULL HN INFORMATION SYSTEMS INC | Mechanism for linking together the files of emulated and host system for access by emulated system users |
5574843, | Apr 26 1991 | Gateway, Inc | Methods and apparatus providing for a presentation system for multimedia applications |
5604862, | Mar 14 1995 | AUTONOMY, INC | Continuously-snapshotted protection of computer files |
5617568, | Dec 14 1994 | International Business Machines Corporation | System and method for supporting file attributes on a distributed file system without native support therefor |
5621663, | Jun 20 1991 | ICL Systems AB | Method and system for monitoring a computer system |
5627842, | Jan 21 1993 | SAMSUNG ELECTRONICS CO , LTD | Architecture for system-wide standardized intra-module and inter-module fault testing |
5628005, | Jun 07 1995 | Microsoft Technology Licensing, LLC | System and method for providing opportunistic file access in a network environment |
5630060, | Jan 13 1993 | Canon Kabushiki Kaisha | Method and apparatus for delivering multi-media messages over different transmission media |
5634010, | Oct 21 1994 | Corps of Discovery Patent Holding LLC | Managing and distributing data objects of different types between computers connected to a network |
5642501, | Jul 26 1994 | EMC Corporaton | Computer method and apparatus for asynchronous ordered operations |
5644718, | Nov 10 1994 | AT&T Corporation | Apparatus using circuit manager to associate a single circuit with each host application where the circuit is shared by a plurality of client applications |
5649152, | Oct 13 1994 | EMC Corporation | Method and system for providing a static snapshot of data stored on a mass storage system |
5649196, | Jul 01 1993 | CA, INC | System and method for distributed storage management on networked computer systems using binary object identifiers |
5666353, | Mar 21 1995 | Cisco Technology, Inc | Frame based traffic policing for a digital switch |
5668958, | Sep 12 1995 | International Business Machines Corporation; IBM Corporation | Heterogeneous filing system with common API and reconciled file management rules |
5673265, | May 19 1994 | Cisco Technology, Inc | Scalable multimedia network |
5675726, | Mar 12 1992 | EMC Corporation | Flexible parity generation circuit |
5675782, | Jun 06 1995 | Microsoft Technology Licensing, LLC | Controlling access to objects on multiple operating systems |
5678006, | Apr 27 1995 | Cisco Technology, Inc | Network switch having network management agent functions distributed among multiple trunk and service modules |
5678007, | Nov 22 1994 | Microsoft Technology Licensing, LLC | Method and apparatus for supporting multiple outstanding network requests on a single connection |
5689701, | Dec 14 1994 | International Business Machines Corporation | System and method for providing compatibility between distributed file system namespaces and operating system pathname syntax |
5694163, | Sep 28 1995 | Intel Corporation | Method and apparatus for viewing of on-line information service chat data incorporated in a broadcast television program |
5696486, | Mar 29 1995 | GOOGLE LLC | Method and apparatus for policy-based alarm notification in a distributed network management environment |
5720029, | Jul 25 1995 | International Business Machines Corporation | Asynchronously shadowing record updates in a remote copy session using track arrays |
5721916, | Nov 18 1994 | Microsoft Technology Licensing, LLC | Method and system for shadowing file system structures from multiple types of networks |
5737523, | Mar 04 1996 | Oracle America, Inc | Methods and apparatus for providing dynamic network file system client authentication |
5737774, | Sep 18 1993 | Spine-Issimus Limited | Device for preventing or reducing the incidence or intensity of pain in the body |
5742752, | Dec 29 1995 | AVAGO TECHNOLOGIES GENERAL IP SINGAPORE PTE LTD | Method for performing a RAID stripe write operation using a drive XOR command set |
5754851, | Apr 10 1992 | Avid Technology, Inc. | Method and apparatus for representing and editing multimedia compositions using recursively defined components |
5761669, | Jun 06 1995 | Microsoft Technology Licensing, LLC | Controlling access to objects on multiple operating systems |
5819292, | Jun 03 1993 | NetApp, Inc | Method for maintaining consistent states of a file system and for creating user-accessible read-only copies of a file system |
5819310, | May 24 1996 | EMC Corporation | Method and apparatus for reading data from mirrored logical volumes on physical disk drives |
5825877, | Jun 11 1996 | ACTIVISION PUBLISHING, INC | Support for portable trusted software |
5826102, | Dec 22 1994 | FLORESCERE ASSETS LIMITED LIABILITY COMPANY | Network arrangement for development delivery and presentation of multimedia applications using timelines to integrate multimedia objects and program objects |
5828839, | Nov 14 1996 | CHARTER COMMUNICATIONS, INC | Computer network chat room based on channel broadcast in real time |
5835953, | Oct 13 1994 | EMC Corporation | Backup system that takes a snapshot of the locations in a mass storage device that has been identified for updating prior to updating |
5854893, | Oct 01 1993 | Pragmatus AV LLC | System for teleconferencing in which collaboration types and participants by names or icons are selected by a participant of the teleconference |
5854903, | Nov 07 1995 | THE CHASE MANHATTAN BANK, AS COLLATERAL AGENT | Optimization method for routing and logical network design in multi-service networks |
5856981, | May 15 1997 | THE CHASE MANHATTAN BANK, AS COLLATERAL AGENT | Reliable connection oriented networks |
5876278, | May 29 1997 | Cooling device | |
5890959, | Mar 31 1998 | Hewlett Packard Enterprise Development LP | High efficiency blower system with integral backflow preventor |
5915087, | Dec 12 1996 | McAfee, LLC | Transparent security proxy for unreliable message exchange protocols |
5931935, | Apr 15 1997 | Microsoft Technology Licensing, LLC | File system primitive allowing reprocessing of I/O requests by multiple drivers in a layered driver I/O system |
5950225, | Feb 28 1997 | NetApp, Inc | Fly-by XOR for generating parity for data gleaned from a bus |
5956491, | Apr 01 1996 | Windy City Innovations, LLC | Group communications multiplexing system |
5956712, | Jun 07 1995 | International Business Machines Corporation | Byte range locking in a distributed environment |
5957612, | Sep 26 1994 | Re-usable breakaway safety joint | |
5963962, | May 31 1995 | Network Appliance, Inc. | Write anywhere file-system layout |
5983364, | May 12 1997 | Microsoft Technology Licensing, LLC | System and method for diagnosing computer faults |
5996086, | Oct 14 1997 | NetApp, Inc | Context-based failover architecture for redundant servers |
5996106, | Feb 04 1997 | U S BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT | Multi bank test mode for memory devices |
5999943, | Oct 31 1997 | Oracle International Corporation | Lob locators |
6000039, | Apr 01 1991 | Hitachi, Ltd. | Data reconstruction method and system wherein timing of data reconstruction is controlled in accordance with conditions when a failure occurs |
6044214, | Apr 10 1997 | NEC Corporation | Fault simulation method operable at a high speed |
6070008, | Jun 07 1995 | GOOGLE LLC | System, method, and computer program product for providing an incremental storage adaptor |
6073089, | Oct 22 1996 | Vivint, Inc | Systems and methods for adaptive profiling, fault detection, and alert generation in a changing environment which is measurable by at least two different measures of state |
6076148, | Dec 26 1997 | EMC IP HOLDING COMPANY LLC | Mass storage subsystem and backup arrangement for digital data processing system which permits information to be backed up while host computer(s) continue(s) operating in connection with information stored on mass storage subsystem |
6101585, | Nov 04 1997 | QUARTERHILL INC ; WI-LAN INC | Mechanism for incremental backup of on-line files |
EP306244, | |||
EP308056, | |||
EP410630, | |||
EP453193, | |||
EP462917, | |||
EP477039, | |||
EP497067, | |||
EP537098, | |||
EP537198, | |||
EP552580, | |||
EP566967, | |||
EP569313, | |||
EP629956, | |||
EP747829, | |||
EP756235, | |||
EP760503, | |||
H12860, | |||
JP1273395, | |||
JP529782, | |||
WO7104, | |||
WO8903086, | |||
WO9113404, | |||
WO9113475, | |||
WO9200834, | |||
WO9429795, | |||
WO9429796, | |||
WO9429807, | |||
WO9821656, | |||
WO9838576, | |||
WO9930254, | |||
WO9945456, | |||
WO9946680, | |||
WO9966401, |
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